Global Patent Index - EP 0974751 A2

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Title (de)

Title (fr)

Publication

Application

Priority

US 11929398 A 19980720

Abstract (en)

The system has hydraulic cartridges (29) which extend from slots (25) in the lifter guides (21) into slots (27) in the reciprocating lifter bodies (19) of the fuel injection system, and which contain stop pins that are forced into an extended position so that they contact the top of the slots in the lifter bodies upon actuation of a pressurized hydraulic supply by an engine controller (63). The system has slots in the lifter guides that receive a hydraulic cartridge and longer slots in the lifter bodies which register with the slots in the lifter guides, with the hydraulic cartridges extending into the slots in the lifter bodies but not contacting them as the lifter bodies are reciprocated by an injection cam. The hydraulic cartridges have a stop pin slidably disposed within them and a hydraulic duct which when filled with pressurized fluid causes the stop pin to extend from the cartridge to contact the top of the slot in the lifter body so as to hold the lifter body off the cam which in turn prevents the fuel injectors from injecting into the engine. An electronic control module receives signals from a number of engine sensors (65,67) which, upon receiving a signal or combination of signals which indicate that the engine is over speeding, loosing lubricating oil pressure or under going some other condition which is likely to result in major damage to the engine, sends a signal to open a solenoid (55) to allow pressurized fluid from a pump (57) to enter the hydraulic cartridge via a check valve (53). The stop pin extends as the lifter body extends and as the lifter body starts to come back down on the pin the pressure in the cartridge reaches a point where it is greater than that supplied by the pump, so the check valve closes to isolate the fluid in the cartridge, which therefore prevents the lifter body from returning any lower.